Sorption characteristics of lead and cadmium in some soils of India

Adhikari, Tapan; Singh, Muneshwar

doi:10.1016/s0016-7061(02)00352-x

Cited by 128 publications

(93 citation statements)

References 15 publications

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“…Resultados similares foram obtidos por Adhikari & Singh (2003), que demonstraram a ocorrência de duas fases nas curvas de adsorção de cádmio e de chumbo, em solos da Índia. A fase inicial da curva de adsorção corresponde à alta energia de ligação, apesar de o solo ter baixa capacidade de adsorção.…”

Section: Resultsunclassified

Adsorção de cádmio e chumbo em solos tropicais altamente intemperizados

Linhares

Filho

Oliveira³

et al. 2009

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi determinar a capacidade de adsorção de cádmio e de chumbo e avaliar a influência das propriedades dos solos sobre os parâmetros de adsorção desses elementos em solos tropicais altamente intemperizados. Foram utilizados quatro Latossolos e um Argissolo. Cadmium and lead adsorption in highly weathered tropical soilsAbstract -The aims of this work were to characterize the adsorption of cadmium and lead and to evaluate the influence of soil properties on adsorption parameters of these elements in highly weathered tropical soils. The experiment was performed in four Oxisols and one Ultisol. Soil samples (1 g) were mixed by shaking for 16 hours with 0.01 mol L -1 CaCl 2 solutions, to which the following doses were added: 0, 10, 20, 30, 40, 60, and 80 μg mL -1 cadmium, and 0, 10, 20, 40, 60, 80, 100, and 120 μg mL -1 lead in the form of nitrates. The elements in the supernatant were analyzed to determine the adsorbed amounts, and the data were fitted to the isotherms of Langmuir and Freundlich. The experimental results were fitted well to the studied model. Maximum adsorption capacity values were between 136 and 1,604 μg g -1 for cadmium, and between 988 and 1,660 μg g -1 for lead, while binding energies were between 0.0036 and 0.0403 μg mL -1 for cadmium, and between 0.0282 and 1.0425 μg mL -1 for lead. The soil properties correlated to the adsorption of cadmium were pH and cation exchange capacity, and the ones correlated to lead were pH and the levels of iron and aluminum oxides.Index terms: Ultisol, Oxisol, adsorption isotherm, heavy metals. IntroduçãoO conhecimento do comportamento adsortivo de metais pelos solos é de grande importância, pois os efeitos desfavoráveis resultantes de altas concentrações estão relacionados à habilidade do solo em adsorver tais elementos (Jordão et al., 2000). Tendo-se em vista a importância do fenômeno da adsorção, é necessário considerar, também, os fatores que o afetam, entre os quais podem ser citados a natureza da fase sólida inorgânica do solo, o pH, o teor de matéria orgânica e a presença de outros íons (Alleoni et al., 2005;Appel et al., 2008). Inicialmente, os poluentes são adsorvidos nos solos por meio de troca iônica ou interações eletrostáticas, forças de van der Waals ou ligações químicas estáveis. Pelo envelhecimento do solo, esses metais podem vir a fazer parte da estrutura de alguns minerais (Araújo et al., 2000). Quando não ocorre uma interação estável do poluente com o solo, pode haver a migração do poluente, o que culmina com a contaminação da água, de lençóis ou da superfície. Bolland et al. (1977) consideram que as duas formas mais comuns para a efetiva avaliação da capacidade de adsorção de íons pelos solos são: a que contempla

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Section: Resultsunclassified

Adsorção de cádmio e chumbo em solos tropicais altamente intemperizados

Linhares

Filho

Oliveira³

et al. 2009

Pesq. agropec. bras.

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“…The high loading of metals in soils may affect the growth of plants and the health of animals, thereby representing a significant threat to public health (Berti and Jacobs, 1996). Consequently, the development of effective strategies to manage heavy metal pollution is of great importance (Adhikari and Singh, 2003) but requires extensive knowledge of the sorption and transport behaviors of heavy metals and of the diverse variables affecting these processes. Several studies have been performed in order to establish the influence of different parameters on heavy metal sorption/desorption (Appel and Ma, 2002;Fonseca et al, 2009b;Fontes et al, 2000;Hanna et al, 2009;Lee et al, 2001;Liu et al, 2006;Sipos et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Mobility of Cr, Pb, Cd, Cu and Zn in a loamy sand soil: A comparative study

et al. 2011

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Interest in soil contamination has been growing in recent years due to the ongoing degradation of soil environments. Therefore, the development of remediation techniques and the study of contaminant sorption and migration are areas of intense research. In this study, the authors sought to evaluate the scenario of co-contamination of a loamy sand soil by multiple heavy metals. To that end, the sorption and transport of five metals-Cr, Pb, Cd, Cu and Zn-was evaluated using representative samples of a soil from the north of Portugal. The tests were conducted in batch and continuous systems using single-and multiple-metal acid solutions to evaluate the effect of metal competition. In accordance with the type of assay-batch or continuous-Langmuir or Convection Dispersion Two-Site Nonequilibrium models were adjusted to explain the sorption/transport data. FTIR analyses were performed on the final samples of the continuous systems. Generally, the results revealed good fitting of the tested models for the metals in competitive and noncompetitive scenarios, with the exception of Zn that was originally present in soil samples at higher concentrations. As expected, the influence of competition was observed in both batch and continuous systems, but with different tendencies. The FTIR spectra also revealed a strong influence of clay minerals and organic matter on the sorption of the metals.

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“…Sorption/desorption studies generally employ the use of a neutral salt solution (for example, Ca(NO 3 ) 2 , CaCl 2 , or NaNO 3 ) to desorb previously sorbed metals from soils or mineral components. In most cases, studies consid ering the sorption/desorption of Cd and Pb have indicated Pb was much less desorbable than Cd (Pardo, 2000;Adhikari and Singh, 2003). However, Ainsworth et al (1994) found Cd desorption to be less than that of Pb at pH 3 on aged hydrous iron oxide.…”

Section: Introductionmentioning

confidence: 99%

Sequential sorption of lead and cadmium in three tropical soils

Appel

Lena

Rhue

et al. 2008

Environmental Pollution

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The sorption and desorption of Pb and Cd in tropical soils is strongly influenced by the order in which these metals enter the soil environment. AbstractIt is important to examine mechanisms of Pb and Cd sorption in soils to understand their bioavailability. The ability of three tropical soils to retain Pb, Cd, and Ca was evaluated. The objectives of this study were to (1) determine the extent to which soil sorption sites are metal specific, (2) investigate the nature of reactions between metals and soil surfaces, and (3) identify how metals compete for sorption sites when they are introduced to soils sequentially or concurrently. Lead was shown to be much less exchangeable than Cd and inhibited Cd sorption. Cadmium had little effect on Pb sorption, though both Ca and Cd inhibited the adsorption of Pb at exchange sites. Lead appears to more readily undergo innersphere surface complexation with soil surface functional groups than either Cd or Ca. Thus, regardless of when Pb is introduced to a soil, it should be less labile than Cd.

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Sorption characteristics of lead and cadmium in some soils of India

Cited by 128 publications

References 15 publications

Adsorção de cádmio e chumbo em solos tropicais altamente intemperizados

Adsorção de cádmio e chumbo em solos tropicais altamente intemperizados

Mobility of Cr, Pb, Cd, Cu and Zn in a loamy sand soil: A comparative study

Sequential sorption of lead and cadmium in three tropical soils

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